Exodus 22:1 speaks about the robber who was found "tunnelling in" to someone's house (vis-a-vis self-defense). Is that just a figure of speech, or did they actually go to that much trouble? (What were houses like back then?) I'd say try the door first ...
I since found that R' Hirsch and others say the word "machteret" simply means "breaking in", not necessarily tunnelling. But for those who say it means tunnelling (e.g. Radak) ... how would they explain?
